I wanted to rate it higher but I just could not, still rating is good.
First thing: Song Kang's character is Doom at your service couple's son! In general this drama reminded me about DAYS and that is one of the reasons I have watched this.
Chemistry was good.
Jo Hye Joo - she reminds me Shuhua from G-idle - her character was soo annoying, I only liked her in last episode. But do not get me wrong, cast did really good job.
Spoiler - there is a happy ending - if someone only watch this type of drama.
If you like drama with non-human--human romance then yes, you have to give it a chance.